Miter-cutting machine



(No Model.)

D H BRENNER MITER CUTTING MACHINE.

No. A499,202. Patented-June 13, 1893.

fia/enjoy UNITED v,STATES PATENT Critics.' y

DAVID H. BRENNER, OF GRAND RAPIDS, MICHIGAN.

MITER-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent N o. 499,202, dated .Tune 13, 1893.

Application filed March 7, 1892.

To all whom it may concern:

Be it known that I, DAVID H. BRENNER, a citizen of the United States, residing at the city'of GrandRapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in AMiter-Cutting Machines, of which the following is a specification.

This invention relates to a new and useful trimming machine used both for cutting miters and angles of different dimensions, and also for 'cutting square across the end of a piece of wood or other material.

The object of the invention is to combine in a simple structure a knife so arranged as to give a shearing and drawing out, in order to obtain the out upon the wood with the least exertion of power, and also to give a smooth clean out. These objects I accomplish by means of the mechanism illustrated in the accompanying drawings, in which- Figure (l) shows a front elevation of my trimmer with the knife set in a substantially perpendicular position. Fig. (2) shows a similar view, with the knife carried to one sidein order to illustrate more fully the draw of the knife as it is moved from a perpendicular position. Fig. (3) shows a vertical sectional view on line -:r of Fig. (1); and Fig. (4) shows a top plan view.

Similar letters refer to similar parts throughout the several views.

A. represents the frame-work which supports the knife. This frame-work extends below the base or table B., and is also provided with upwardly extending side-pieces, rising at right angles to the bed, which form rests against which the stock is placed in cutting it. It is also provided with a guide or connection between the upright parts, for the purpose of guiding `and directing the course of the knife.

In the example of my invention shown in the drawings, F, represents a slot in which moves a bolt- D., which bolt may be provided with a friction roller if desired, but inasmuch as the same may be operated without a friction roller, I have not shown a friction roller in the drawings.

K. represents the knife, which turns on a pivot E., which pivot E. passes through a slot in the knife, so as to allow the knife to move Serial No. 424,095. (No model.)

longitudinally. When the knife is in a perpendicular position, the pivot E. rests at or near the bottom of the slot. As the knife is moved in either direction from a perpendicuknife approaches the upright parts of the frame A., and at the same time, being guided by the bolt D. in the slot F., it is drawn downward, so `that it has a longitudinal movement.

In the drawings I have shown a slot C., which may be used as a guide for giving the longitudinal movement to the knife, the slot C. being formed so as to give the knife the same movement as is given to itby the bolt D. in the slot F. When I desire to obtain greater leverage I use a lever, as L., which is pivoted to the knife K. by pivot P', which pivot P passes through the slot G. and is preferably provided with a washer W. The lower end of vthe lever L. is pivoted by means of the pivot Rito the frame A., said pivot P. passing through the slot C. This pivot may also be provided with a washer, as W. When the knife is operated by the lever L. the pivot P. follows the slot C., but in case the bolt D. is used as a guide this slot C. may not conform closely to the travel of the pivot. As the knife K. is driven from a perpendicular to an inclined position/in either direction bythe lever L. the longitudinal movement of the knife carries the pivot P from one end of the slot G. to the other, and vice versa.

While I prefer to operate my trimmer knife by means of a lever, for the purpose of obtaining greater power, it is evident that it may be operated by an upward extension made rigid or integral with the' kknife itself, as it will be observed that the knife will have precisely the same movement whether operated by a lever attached as above described, or by a rigid lever.

On the bed of the machine I provide a gage or stop for regulating the angle to be out upon the stock to be operated upon. This may be constructed in any suitable manner, but the IOO form shown in the drawings is preferred by me, the same consisting of a curved groove, a stationary plate attached thereto and held in the required position by means of a thumbnut and bolt. R. R. represent the grooves or curved slots, T. T. represent the gages, and N. N. thumb-nuts for attaching the gages in proper position.

In cutting the stock it is placed upon the bed so as to rest against the gage, the front end resting against the posts or upright part-s A. A. The frame A. and bed B. may be constructed in separate parts and properly attached, or may be made integral with each other, and the knife K. may be supported or guided in any suitable manner so as to hold the same in close contact with the edge of the bed and frame, in order to give both a shear and a draw cut.

I-Iaving thus described my invention, what I claim to have invented, and desire to secure by Letters Patent, is-

1. The combination of abed provided with an upright frame extended below the upper surface of the bed, a double edged knife pivotally mounted on the downward projecting portion of said frame and adapted to have an oscillatory and longitudinal movement in close contact with said bed and frame, a lever for actuating the knife and a guide through which the longitudinal movement is imparted to the knife as the same is oscillated in either direction for the purpose of operating with a downward and shearing cut upon the stock supported on the bed, substantially as described.

2. In a trimming machine, the combination of a knife provided with a bolt upon which said knife turns and slides, a bed provided with an upright frame and a slot with which the guide bolt of the knife engages, said knife adapted for movement radially and longitudinally, moving in close contact with the bed and upright frame in order to give both a drawing and shearing cut upon the stock, all substantially as described.

3. The combination of a bed and upright frame extending below the upper surface of the bed, a knife pivoted to the downward projection of the frame, a slot in the knife through which the pivot extends,a bolt moving in a groove adapted to give a longitudinal movement to the knife as it is shifted in either direction, substantially as described.

4:. The combination of aknife pivoted to a downward projection of the frame or bed, a bed supporting a frame, the frame provided with a slot, a knife provided with a bolt engaging said slot, said slot curved so as to give a longitudinal movement to the knife as the same is oscillated in either direction upon its fulcrum or pivot, substantially as described.

5. The combination of a bed having a downward extension, an upright frame, a knife pivoted to said downward extension, provided with a bolt moving in a slot adapted to give a longitudinal movement to said knife, a lever or handle pivoted to the downward extension through a slot or opening in the knife, and also pivoted to the knife through a slot or opening, substantially as shown and described.

.In witness whereof I have hereunto set hand and seal in the presence of two witmy DGSSGS.

DAVID H. BRENNER.

Witnesses:

HARRY P. VAN WAGNER, EDWARD 'FAGGARr 

